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By certification 
(1) Standard: GB, DIN, ISO, ANSI/ASTM, BS, JIS.
(2) Grade: 4.8, 6.8, 8.8, 10.9, 12.9.
(3) Size: M6-M100, 1/4"-4", length to 12 feet.
(4) Surface: Plain, black oxide, galvanized, HDG, YZP, dacromet, etc.
(5) Material: Alloy Steel.
(2) Grade: 4.8, 6.8, 8.8, 10.9, 12.9.
(3) Size: M6-M100, 1/4"-4", length to 12 feet.
(4) Surface: Plain, black oxide, galvanized, HDG, YZP, dacromet, etc.
(5) Material: Alloy Steel.
